code: def test_nsmallest_nan_when_keep_is_all(self):
      # GH#46589
      s = Series([1, 2, 3, 3, 3, None])
      result = s.nsmallest(3, keep="all")
      expected = Series([1.0, 2.0, 3.0, 3.0, 3.0])
      tm.assert_series_equal(result, expected)
  
      s = Series([1, 2, None, None, None])
      result = s.nsmallest(3, keep="all")
      expected = Series([1, 2, None, None, None])
      tm.assert_series_equal(result, expected)
  
file_path: pandas/pandas/tests/series/methods/test_nlargest.py
imports: import numpy
  import pytest
  import pandas
  from pandas import Series
  import pandas._testing
label_desc: Use image node_id 11 for calling the TestSeriesNLargestNSmallest obj's underlying member method code with example usage: obj.test_nsmallest_nan_when_keep_is_all() without return types